<template>
  <div class="dashboard-container">
    <!--查询表单-->
    <el-form :inline="true" class="demo-form-inline">
      <el-form-item>
        <el-input v-model="courseQuery.title" placeholder="课程标题"/>
      </el-form-item>
        <el-form-item>
            <el-select v-model="courseQuery.subjectParentId" placeholder="一级分类" @change="subjectLevelOneChanged">
                <el-option
                    v-for="subject in subjectOneList"
                    :key="subject.id"
                    :label="subject.title"
                    :value="subject.id"/>
            </el-select>
            <!-- 二级分类 -->
            <el-select v-model="courseQuery.subjectId" placeholder="二级分类" @change="handleChange">
                <el-option
                    v-for="subject in subjectTwoList"
                    :key="subject.id"
                    :label="subject.title"
                    :value="subject.id"/>
            </el-select>
        </el-form-item>
        <!-- 课程讲师 -->
        <el-form-item>
            <el-select v-model="courseQuery.teacherId" placeholder="课程讲师">
                <el-option
                    v-for="teacher in teacherList"
                    :key="teacher.id"
                    :label="teacher.name"
                    :value="teacher.id"/>
            </el-select>
        </el-form-item>
      <el-form-item>
        <el-select v-model="courseQuery.status" clearable placeholder="课程状态">
          <el-option value="Normal" label="已发布"/>
          <el-option value="Draft" label="未发布"/>
        </el-select>
      </el-form-item>
      <el-form-item label="添加时间">
        <el-date-picker
          v-model="courseQuery.begin"
          type="datetime"
          placeholder="选择开始时间"
          value-format="yyyy-MM-dd HH:mm:ss"
          default-time="00:00:00"
        />
      </el-form-item>
      <el-form-item>
        <el-date-picker
          v-model="courseQuery.end"
          type="datetime"
          placeholder="选择截止时间"
          value-format="yyyy-MM-dd HH:mm:ss"
          default-time="00:00:00"
        />
      </el-form-item>
      <el-button type="primary" icon="el-icon-search" @click="getList()">查询</el-button>
      <el-button type="default" @click="resetData()">清空</el-button>
    </el-form>

    <!-- 表格 -->
    <el-table
      :data="list"
      border
      fit
      highlight-current-row>
      <el-table-column
        label="序号"
        width="70"
        align="center">
        <template slot-scope="scope">
          {{ (page - 1) * limit + scope.$index + 1 }}
        </template>
      </el-table-column>
      <el-table-column prop="title" label="课程标题" width="532" />
      <el-table-column prop="price" label="销售价格" width="220" />
      <el-table-column prop="lessonNum" label="总课时" width="220" />
      <el-table-column prop="buyCount" label="销售数量" width="220" />
      <el-table-column prop="viewCount" label="浏览数量" width="220" />
      <el-table-column label="课程状态" width="220">
        <template slot-scope="scope">
          {{ scope.row.status==="Normal"?'已发布':'未发布' }}
        </template>
      </el-table-column>
      <el-table-column prop="gmtCreate" label="添加时间" width="160"/>
      <el-table-column label="操作" width="500" align="center">
        <template slot-scope="scope">
          <router-link :to="'/course/info/'+scope.row.id">
            <el-button type="primary" size="mini" icon="el-icon-edit">编辑课程基本信息</el-button>
          </router-link>
          <router-link :to="'/course/chapter/'+scope.row.id">
            <el-button type="primary" size="mini" icon="el-icon-edit">编辑课程大纲息</el-button>
          </router-link>
          <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeDataById(scope.row.id)">删除课程信息</el-button>
        </template>
      </el-table-column>
    </el-table>
    <!-- 分页 -->
    <el-pagination
      :current-page="page"
      :page-size="limit"
      :total="total"
      style="padding: 30px 0; text-align: center;"
      layout="total, prev, pager, next, jumper"
      @current-change="getList"
    />
  </div>
</template>
<script>
import course from '@/api/edu/course'
import subject from '@/api/edu/subject'
export default {
    data() { // 定义变量和初始值
        return {
            list: [],
            page: 1,
            limit: 10,
            total: 0,
            courseQuery: {},
            subjectOneList: [],
            subjectTwoList: [],
            teacherList: []
        }
    },
    created() { // 页面渲染之前执行，一般调用methods中定义的方法
        this.init()
    },
    methods: { // 创建具体的方法，调用teacher.js中定义的方法
        init() {
            //初始化所有讲师
            this.getTeacherList()
            //初始化一级分类
            this.getOneSubject()
            this.getList()
        },
        getList(page = 1) {
            this.page = page
            course.getPageCourseCondition(this.page, this.limit, this.courseQuery).then(response => { // 请求成功
                this.list = response.data.rows
                this.total = response.data.total
                console.log(this.list)
                console.log(this.total)
            })
        },
        resetData() { // 表单清空的方法
            this.courseQuery = {}
            this.subjectTwoList = []
            this.getList()
        },
        removeDataById(courseId) {
            this.$confirm('此操作会永久删除课程，是否继续？', '提示', {
                confirmButtonText: '确认',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                course.removeCourseByCourseId(courseId).then(response => {
                    this.$message({
                        type: 'success',
                        message: '删除课程成功！'
                    })
                    this.getList()
                })
            })
        },
        subjectLevelOneChanged(value) {
            for(var i=0;i<this.subjectOneList.length;i++) {
                //每个一级分类
                var oneSubject = this.subjectOneList[i]
                //判断：所有一级分类id 和 点击一级分类id是否一样
                if(value === oneSubject.id) {
                    //从一级分类获取里面所有的二级分类
                    this.subjectTwoList = oneSubject.children
                    //把二级分类id值清空
                    this.courseQuery.subjectId = ''
                }
            }
        },
        handleChange() {
            this.$forceUpdate()
        },
        getTeacherList() {
            course.getTeacherList().then(response => {
                this.teacherList = response.data.items
            })
        },
        getOneSubject() {
            subject.getSubjectList().then(response => {
                this.subjectOneList = response.data.list
            })
        }
    }
}
</script>
